$$\frac{(2.1\times10^{6})\times(4.0\times10^{-3})}{4.2\times10^{-4}}$$
$20000000$
$$\frac{2.1\times 10^{3}\times 4}{4.2\times 10^{-4}}$$
$$\frac{2.1\times 4\times 10^{7}}{4.2}$$
$$\frac{8.4\times 10^{7}}{4.2}$$
$$\frac{8.4\times 10000000}{4.2}$$
$$\frac{84000000}{4.2}$$
$$\frac{840000000}{42}$$
$$20000000$$
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$2^{8}\times 5^{7}$
